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TSI showed improvement of intraventricular synchrony after CRT. (A) Before CRT, TSI showed intraventricular dyssynchrony with a maximum wall delay of 881 ms in basal segments. (B) At 5 months after CRT, TSI demonstrated considerably improved intraventricular synchrony with a maximum wall delay of 63 ms in the same segments. TSI, tissue synchronization imaging; CRT, cardiac resynchronization therapy.
